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抓住关键时期用药在螨类虫口基数低时用药,能较长时间地控制螨类危害,即越冬后第一代虫口和螨卵孵化初期是用药防治的最佳时机,此时螨类抗性最弱。目前,大部分果农都忽视了秋、冬季螨类的防治。而秋季螨类的防治也是全年的中心,防治效果的好坏会影响到越冬螨、卵基数的多少,影响到第二年螨类发生量的大小。螨类防治的指标为:①开花前平均每叶1-2头或春稍芽长1-2厘米;②开花后平均每叶4-5头。超过防治指标时用药,会对果树造成危害,虫口密度大,增加了防治难度,提高了用药成本,难以达到理想的防治效果。
Seize the key period of medication in the mite insects low base when the medication can be a long time to control the damage of mites, that is, the first generation after the winter hatchling and mite egg hatching is the best time to control the drug, then mite resistance The weakest. At present, most farmers ignore the control of mites in autumn and winter. Autumn mites prevention and control is also the center of the year, the quality of the control effect will affect the winter mites, the number of egg base, affecting the size of the second year of occurrence of mites. Mites control indicators: ① before flowering 1-2 leaves per head or spring slightly 1-2 cm long bud; ② after flowering an average of 4-5 heads per leaf. Exceed the prevention and treatment index medication, will cause harm to the fruit trees, insect population density, increased the difficulty of prevention and treatment, improve the cost of medication, it is difficult to achieve the desired effect of prevention and treatment.